Outdoor Warning Sirens

Warning Sirens | Protecting County Citizens

The Emergency Communications Commission is responsible for the maintenance and repair of the outdoor warning siren system located throughout St. Louis County.

Siren Testing Information

The outdoor warning sirens are tested monthly, weather permitting, on the first Monday of the month at 11:00 AM. There will be a one-minute tone followed by a voice announcement.
Because the outdoor warning sirens are designed to be heard outside, we also recommend the use of weather alert radios in homes and businesses.

To report a siren that does not sound during the monthly test or to report an unscheduled siren activation please call the ECC Customer Service Line at 314-615-9551 or send a detailed email to ecc@stlouisco.com including your name, address and phone number.

Click here to be redirected to the Office of Emergency Management for further information regarding outdoor warning sirens.

Siren Update

As of today there are 204 sirens installed throughout St. Louis County. Click here to see a listing by zip code.

Siren Project

St. Louis County activated a new outdoor warning system in January 2012. The new system has 204 sirens, most located at new sites to more efficiently cover the entire County population. The $7.5 million system was funded by revenue from an Emergency Communications Sales Tax, which was passed by County voters in November 2009. The $100 million bond issue will also replace individual police, fire and EMS communications systems, uniting them under one system.

The sirens give instantaneous feedback on their functional status. This feature will reduce the amount of “down time” and provide for quicker repairs. Remember that the outdoor warning sirensare designed to be heardoutside. The Office of Emergency Management still recommends that weather alert radios be used inside homes and businesses.

If you have any questions regarding the outdoor warning system, please call the ECC Customer Service Line at 314-615-9551 or email at ecc@stlouisco.com.